阅读说明：本技术 一种螺杆转子及压缩机 (screw rotor and compressor ) 是由 武晓昆 龙忠铿 李日华 毕雨时 于 2019-10-31 设计创作，主要内容包括：本发明提供了一种螺杆转子及压缩机,涉及压缩机技术领域,解决了现有螺杆压缩机阴、阳转子齿数不相同,啮合关系非一一对应,尺寸偏差的影响较大,易产生振动和噪声的技术问题。该螺杆转子包括阴转子和阳转子,所述阴转子的齿数与所述阳转子的齿数比为1,所述阴转子的齿与所述阳转子的齿能够一一对应啮合。螺杆转子的阴转子的齿数与阳转子的齿数比为1,阴转子的齿与阳转子的齿能够一一对应啮合,大大降低了尺寸偏差的影响,阴转子与阳转子啮合时不易产生振动和噪声。(The invention provides screw rotors and a compressor, relates to the technical field of compressors, and solves the technical problems that the tooth numbers of a female rotor and a male rotor of an existing screw compressor are different, the meshing relationship is not corresponding, the influence of size deviation is large, and vibration and noise are easy to generate.)

The screw rotor is characterized by comprising a female rotor and a male rotor, wherein the gear ratio of the number of teeth of the female rotor to the teeth of the male rotor is 1, and the teeth of the female rotor and the teeth of the male rotor can be correspondingly meshed with .

2. The screw rotor of claim 1, wherein the number of teeth of the male rotor is 8 or more.

3. Screw rotor according to claim 1, characterised in that the number of teeth of the male rotor is 8 or 10.

4. The screw rotor of claim 1, wherein a curve-to-curve seal is formed between the female rotor and the male rotor.

5. The screw rotor of claim 1, wherein when the tooth number ratio of the female rotor to the male rotor is 8/8, the female and male rotor profile data coordinates are as follows:

6. the screw rotor of claim 1, wherein when the tooth number ratio of the female rotor to the male rotor is 10/10, the female and male rotor profile data coordinates are as follows:

7. the screw rotor of claim 1, wherein the male rotor rotates at a speed in the range of 6000 to 8000 rpm.

8. Screw rotor according to claim 1, characterised in that the ratio between the number of teeth of the female rotor and the number of teeth of the male rotor is 8/8, and the compressor speed is 7500rpm, with a corresponding noise characteristic frequency n 1000Hz (n-1, 2, 3, · -5).

9. The screw rotor as claimed in claim 1, wherein the ratio of the number of teeth of the female rotor to the number of teeth of the male rotor is 10/10, and the compressor speed is 6000 rpm.

10. The screw rotor of claim 1, wherein the rotor meshing gap is set to 3-5 filaments.

Screw compressor of the kind 11, , comprising a screw rotor according to any of claims 1-10 to .

Technical Field

The invention relates to the technical field of compressors, in particular to screw rotors and a compressor.

Background

The screw compressor realizes the volume change through the periodical meshed rotation of a female rotor and a male rotor which are arranged in parallel , thereby completing the processes of air suction, compression and air exhaust, in the screw compressor, the male rotor is driven to rotate by a motor, the female rotor is driven to rotate by the male rotor, the friction noise generated by the female rotor and the male rotor in the meshed process is the main source of mechanical noise of the screw compressor, the exhaust airflow pulsation caused by the periodical change of the exhaust hole opening area is the main source of hydrodynamic noise, the noise characteristic frequency of the screw compressor is closely related to the rotating speed RPM and the number of teeth Z1 of the male rotor, and the fundamental frequency f is (RPM/60) Z1.

The applicant has found that the prior art has at least the following technical problems:

since the female and male rotors of the screw compressor have different numbers of teeth and do not correspond to in the meshing relationship, dimensional variations are likely to occur during meshing, and vibration and noise are likely to occur.

The tooth ratio of a female rotor to a male rotor of the screw compressor is usually 5/6, 3/5, 4/6, 6/8 and 6/7, the characteristic frequency of noise is usually below 250-500 Hz, the low-frequency noise belongs to low-frequency noise, the propagation distance is long, and the noise pollution coverage range is wide.

Disclosure of Invention

The invention aims to provide screw rotors and a compressor, which are used for solving the technical problems that in the prior art, the number of teeth of a female rotor and a male rotor of the screw compressor is different, the meshing relationship is not corresponding, the influence of size deviation is large, and vibration and noise are easy to generate.

In order to achieve the purpose, the invention provides the following technical scheme:

the screw rotors provided by the invention comprise a female rotor and a male rotor, wherein the gear ratio of the number of teeth of the female rotor to the male rotor is 1, and the teeth of the female rotor and the teeth of the male rotor can be correspondingly meshed with .

Optionally, the number of teeth of the male rotor is equal to or greater than 8.

Optionally, the number of teeth of the male rotor is 8 or 10.

Optionally, a curve-to-curve seal is formed between the female rotor and the male rotor.

Alternatively, when the tooth number ratio of the female rotor to the male rotor is 8/8, the female and male rotor profile data coordinates are as follows:

alternatively, when the tooth number ratio of the female rotor to the male rotor is 10/10, the female and male rotor profile data coordinates are as follows:

optionally, the rotating speed of the male rotor ranges from 6000rpm to 8000 rpm.

Optionally, the tooth ratio of the female rotor to the male rotor is 8/8, and the compressor speed is 7500rpm, with a corresponding noise signature frequency of n 1000Hz (n ═ 1, 2, 3, · · 5).

Optionally, the ratio of the number of teeth of the female rotor to the number of teeth of the male rotor is 10/10, and the compressor speed is 6000 rpm.

Optionally, the rotor mesh gap is set to 3-5 filaments.

The invention provides screw compressors, which comprise the screw rotor of any .

According to the screw rotors and the compressor, the ratio of the number of teeth of the female rotor to the number of teeth of the male rotor of the screw rotors is 1, the teeth of the female rotor and the teeth of the male rotor can be correspondingly meshed with each other , the influence of size deviation is reduced, and vibration and noise are not easy to generate when the female rotor and the male rotor are meshed with each other.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a line drawing of the face profiles of screw rotors with a female to male rotor tooth ratio of 8/8 according to an embodiment of the present invention;

FIG. 2 is a line drawing of the face profiles of screw rotors with a female to male rotor tooth ratio of 10/10 according to an embodiment of the present invention;

figure 3 shows the yin-yang rotor gap profile.

In figure 1, the female rotor; 2. a male rotor.

Detailed Description

The technical solution of the present invention will be described in detail below to make the objects, technical solutions and advantages of the present invention clearer.

The invention provides screw rotors, which comprise a female rotor 1 and a male rotor 2, wherein the gear ratio of the number of teeth of the female rotor 1 to the number of teeth of the male rotor 2 is 1, and the teeth of the female rotor 1 and the teeth of the male rotor 2 can be correspondingly meshed with each other by .

The tooth number ratio of the female rotor 1 to the male rotor 2 is 1, the teeth of the female rotor 1 and the teeth of the male rotor 2 can be correspondingly meshed, the influence of size deviation is reduced, and vibration and noise are not easy to generate when the female rotor is meshed with the male rotor.

In an alternative embodiment, the number of teeth of the male rotor is equal to or greater than 8.

The more the number of teeth of the male rotor 2 is, the higher the noise basic frequency of the screw compressor is, the more the number of teeth of the male rotor is greater than or equal to 8, namely the number of teeth of the male rotor 2 is increased, and the noise basic frequency of the screw compressor is improved, so that the deviation to high frequency is realized, the noise propagation distance is reduced, and the noise pollution range is reduced; and the high-frequency noise is more convenient for the later treatment and control. The sound insulation cover, the sound absorption cotton and the like have obvious attenuation effect on high-frequency noise, so that the total noise value can be effectively controlled after the basic frequency of the rotor noise shifts to high frequency.

As an alternative embodiment, the number of teeth of the male rotor 2 is 8 or 10, i.e. the ratio of the number of teeth of the female rotor 1 to the number of teeth of the male rotor 2 is 8/8 or 10/10, see fig. 1 and 2.

As an alternative embodiment, a curve-to-curve seal is formed between the female rotor 1 and the male rotor 2.

The tooth curves formed by the female rotor and the male rotor adopt secondary curves (circular arcs, ellipses, hyperbolas, parabolas and the like) to form curved surface-to-curved surface sealing, so that the leakage between teeth is reduced.

As an alternative embodiment, as shown in fig. 1, when the tooth number ratio of the female rotor 1 to the male rotor 2 is 8/8, the male and female rotor profile data coordinates are as follows:

when the tooth ratio of the female rotor to the male rotor is 8/8, the center distance A is 137mm, the length-diameter ratio L/D is 1.5, the T1/L is 1.2, the lead of the male rotor is 320mm, and the theoretical air output is 443.6m3/h @3000 rpm.

As an alternative embodiment, as shown in fig. 2, when the tooth number ratio of the female rotor 1 to the male rotor 2 is 10/10, the male and female rotor profile data coordinates are as follows:

as an alternative embodiment, the rotation speed of the male rotor 2 ranges from 6000 to 8000 rpm.

The rotating speed range of the male rotor 2 is 6000-8000 rpm, the rotor meshing frequency reaches more than 1000Hz, and compared with the existing low-frequency noise, the transmission distance is short.

As an alternative embodiment, the tooth ratio of the female rotor 1 to the male rotor 2 is 8/8, and the compressor speed is 7500rpm, with a corresponding noise characteristic frequency of n × 1000Hz (n ═ 1, 2, 3, · · 5).

The rotating speed of a compressor provided with the screw rotor is 7500rpm, the meshing frequency of the rotor can reach 1000Hz, the corresponding noise characteristic frequency is n × 1000Hz (n is 1, 2, 3 · · 5), the radiation noise of the compressor is high-frequency-band noise, and the total noise value and the transmission distance can be effectively controlled through external sound insulation measures.

As an alternative embodiment, the ratio of the number of teeth of the female rotor 1 to the number of teeth of the male rotor 2 is 10/10, and the compressor speed is 6000 rpm.

The rotating speed of the compressor can be properly reduced after 10/10 teeth are arranged, and the characteristic frequency of the compressor can reach 1000Hz when the rotating speed is 6000 rpm.

As an optional embodiment, the rotor meshing gap is set to be 3-5 wires.

The meshing clearance of the rotor is set to be 3-5 wires, and leakage between teeth is reduced. Figure 3 shows the yin-yang rotor gap profile.

As an alternative embodiment, the length-to-diameter ratio L/D of the rotor ranges from 1.2 to 1.85.

As an alternative embodiment, the ratio T1/L of the lead to the length of the male rotor 2 ranges from 1.1 to 1.7.

The invention provides screw compressors, which comprise the screw rotor of any .

The gear ratio of the female rotor to the male rotor is 1, so that the influence of size deviation during meshing is reduced, and vibration and noise are not easy to generate; and after the number of teeth of the male rotor of the screw rotor is increased, the noise fundamental frequency of the screw compressor shifts to high frequency, and the noise propagation distance and the pollution range are reduced.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.